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Improved solar-thermal heat exchanger for space heating with surface roughness: A numerical parametric investigation and its optimization

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  • Kumar, Rajneesh

Abstract

The heat exists in solar radiation can be extracted and utilized in drying and heating applications. In the present study, an attempt is made to improve the performance of a solar-thermal heat exchanger consisting of a flat-plate collector by producing roughness on the heat-absorbing surface. A repeated pattern of staggered arc roughness is introduced along the streamlines and the roughness is characterized using height ratio, relative pitch, number of gaps, etc. The influence of the roughness characteristics is studied on the thermal performance by computational fluid dynamics. The developed model is validated with well-established relations before predicting the results for the proposed design. The effective mixing of the viscous sublayer and free stream results in a significant enhancement in the thermal performance and it is predicted that the proposed model improves heat transfer up to 5.57 times that obtained in the conventional one. The comparative heat transfer over continuous arc-shaped roughness is increased from 32.72% to 62.46% and 44.62%–62.46% with the variation of number of gap and, gap with ratio from 1 to 3, and 0.5 to 1.0, respectively However, the disturbance in the streamlined pattern in the flowfield resulted in a pressure loss/pumping power increment of 4.46 times in the system. The results are summarized in correlation for heat augmentation and pressure loss which estimate results with the accuracy of 12% and 10%, respectively.

Suggested Citation

  • Kumar, Rajneesh, 2024. "Improved solar-thermal heat exchanger for space heating with surface roughness: A numerical parametric investigation and its optimization," Renewable Energy, Elsevier, vol. 226(C).
  • Handle: RePEc:eee:renene:v:226:y:2024:i:c:s0960148124004142
    DOI: 10.1016/j.renene.2024.120349
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    References listed on IDEAS

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    1. Sahu, Mukesh Kumar & Prasad, Radha Krishna, 2016. "Exergy based performance evaluation of solar air heater with arc-shaped wire roughened absorber plate," Renewable Energy, Elsevier, vol. 96(PA), pages 233-243.
    2. Alam, Tabish & Saini, R.P. & Saini, J.S., 2014. "Heat and flow characteristics of air heater ducts provided with turbulators—A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 31(C), pages 289-304.
    3. Kumar, Rajneesh & Goel, Varun, 2021. "Unconventional solar air heater with triangular flow-passage: A CFD based comparative performance assessment of different cross-sectional rib-roughnesses," Renewable Energy, Elsevier, vol. 172(C), pages 1267-1278.
    4. Alam, Tabish & Kim, Man-Hoe, 2018. "A comprehensive review on single phase heat transfer enhancement techniques in heat exchanger applications," Renewable and Sustainable Energy Reviews, Elsevier, vol. 81(P1), pages 813-839.
    5. Saxena, Abhishek & Varun, & El-Sebaii, A.A., 2015. "A thermodynamic review of solar air heaters," Renewable and Sustainable Energy Reviews, Elsevier, vol. 43(C), pages 863-890.
    6. Kumar, Rajneesh & Varun, & Kumar, Anoop, 2016. "Thermal and fluid dynamic characteristics of flow through triangular cross-sectional duct: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 61(C), pages 123-140.
    7. Kumar, Rajneesh & Sharma, Akshay & Goel, Varun & Sharma, Rajesh & Sethi, Muneesh & Tyagi, V.V., 2023. "An experimental investigation of new roughness patterns (dimples with alternative protrusions) for the performance enhancement of solar air heater," Renewable Energy, Elsevier, vol. 211(C), pages 964-974.
    8. Alam, Tabish & Kim, Man-Hoe, 2017. "A critical review on artificial roughness provided in rectangular solar air heater duct," Renewable and Sustainable Energy Reviews, Elsevier, vol. 69(C), pages 387-400.
    9. Karmveer & Naveen Kumar Gupta & Tabish Alam & Raffaello Cozzolino & Gino Bella, 2022. "A Descriptive Review to Access the Most Suitable Rib’s Configuration of Roughness for the Maximum Performance of Solar Air Heater," Energies, MDPI, vol. 15(8), pages 1-46, April.
    10. Kumar, Dheeraj & Layek, Apurba, 2022. "Nusselt number and friction characteristics of solar air heater roughened with novel twisted V-shaped staggered ribs using liquid crystal thermography," Renewable Energy, Elsevier, vol. 201(P1), pages 651-666.
    11. Goel, Varun & Kumar, Rajneesh & Bhattacharyya, Suvanjan & Tyagi, V.V. & Abusorrah, Abdullah M., 2021. "A comprehensive parametric investigation of hemispherical cavities on thermal performance and flow-dynamics in the triangular-duct solar-assisted air-heater," Renewable Energy, Elsevier, vol. 173(C), pages 896-912.
    12. Nidhul, Kottayat & Kumar, Sachin & Yadav, Ajay Kumar & Anish, S., 2020. "Enhanced thermo-hydraulic performance in a V-ribbed triangular duct solar air heater: CFD and exergy analysis," Energy, Elsevier, vol. 200(C).
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